function []=chapter3_2run()
    [u,err] = Neumann(2,100);
    mesh(u);
    'press any key to continue'
    pause
    mesh(err);
    
    'press any key to continue'
    pause
    [u,err] = Dirichlet(2,100);
     mesh(u);
    'press any key to continue'
    pause
    mesh(err);
    
    'press any key to continue'
    pause
   
end